pgmcrater --version (return code: 0)
pgmcrater: Using libpbm from Netpbm Version: Netpbm 10.0
pgmcrater: BSD defined
pgmcrater: RGB_ENV='RGBDEF'
pgmcrater: RGBENV= 'RGBDEF' (env vbl is unset)
pgmcrater -h (return code: 1)
usage: pgmcrater [-number <n>] [-width|-xsize <w>]
[-height|-ysize <h>] [-gamma <f>]